352643661 has 6 divisors (see below), whose sum is σ = 509374190. Its totient is φ = 235095768.

The previous prime is 352643653. The next prime is 352643663. The reversal of 352643661 is 166346253.

352643661 is a `hidden beast` number, since 3 + 5 + 2 + 643 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 291897225 + 60746436 = 17085^2 + 7794^2 .

It is not a de Polignac number, because 352643661 - 2³ = 352643653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (352643663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19591306 + ... + 19591323.

Almost surely, 2^352643661 is an apocalyptic number.

It is an amenable number.

352643661 is a deficient number, since it is larger than the sum of its proper divisors (156730529).

352643661 is a wasteful number, since it uses less digits than its factorization.

352643661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39182635 (or 39182632 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 352643661 is about 18778.8088280381. The cubic root of 352643661 is about 706.4997738620.

The spelling of 352643661 in words is "three hundred fifty-two million, six hundred forty-three thousand, six hundred sixty-one".